Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac{ 1 }{ \sqrt{ 4- \sqrt{ 15 } } } - \frac{ 1 }{ \sqrt{ 4+ \sqrt{ 15 } } }$$

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